When you have diabetes, it's important to keep your blood sugar levels within the range recommended by your healthcare professional. But many things can make your blood sugar levels change, sometimes quickly. Find out some of the factors that can affect blood sugar. Then learn what you can do to manage them.FoodHealthy eating is important for everyone. But when you have diabetes, you need to know how foods affect your blood sugar levels. It's not only the type of food you eat. It's also how much you eat and the types of food you combine in meals and snacks.What to do:Learn about planning balanced meals. A healthy-eating plan includes knowing what to eat and how much to eat. Two common ways to plan meals are carbohydrate counting and the plate method. Ask your healthcare professional or a registered dietitian if either type of meal planning is right for you.Understand carbohydrate counting. Counting carbs involves keeping track of how many grams of carbohydrates you eat and drink during the day. If you take diabetes medicine called insulin at mealtimes, it's important to know the amount of carbohydrates in foods and drinks. That way, you can take the right dose of insulin.Among all foods, carbs often have the biggest impact on blood sugar levels. That's because the body breaks them down into sugar, which raises blood sugar levels. Some carbs are better for you than others. For example, fruits, vegetables and whole grains are full of nutrients. They have fiber that helps keep blood sugar levels more stable too. Eat fewer refined, highly processed carbs. These include white bread, white rice, sugary cereal, cakes, cookies, candy and chips.Get to know the plate method. This type of meal planning is simpler than counting carbs. The plate method helps you eat a healthy balance of foods and control portion sizes.Use a 9-inch plate. Fill half of the plate with nonstarchy vegetables. Examples include lettuce, cucumbers, broccoli, tomatoes and green beans. Divide the other half of the plate into two smaller, equal sections. You might hear these smaller sections called quarters. In one quarter of the plate, place a lean protein.